#1. Spikeridged Steed

Expansion: Journey to Un'Goro
Spikeridged Steed is much more powerful and impactful in Arena than Constructed. In Arena, you don't normally have Silence or too many hard removals. You need to deal with +4/+12 worth of stats, both from the buffed minion as well as a 2/6 Taunt. There was a time when you could draft 3 or 4 Spikeridged Steeds and basically create a huge defence while your opponent struggles to destroy your Taunts.
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It's safe to say that Arena players will be happy this card is leaving.
Honourable Mentions
Fungalmancer

Expansion: Kobolds & Catacombs
Although a Neutral card, Fungalmancer has a lot of synergy with Paladin cards. Paladins can constantly generate 1/1 Silver Hand Recruits and small token minions. So giving these small guys or even the big guys a +2/+2 buff is really strong and impactful. Mushroom Power!
Stonehill Defender

Expansion: Journey to Un'Goro
Stonehill Defender is probably the best Neutral card for Paladin in Arena. You can discover legendary Taunts such as Tirion, Sunkeeper Tarim or Zilliax. The range to choose from for Paladin is much better than most classes. Besides killing Silverback Patriarch, Stonehill Defender gives some serious value not just to Paladin, but all classes.
Drygulch Jailor

Expansion: Kobolds & Catacombs
Drygulch Jailor does not look like a threat, but the tokens he generates can come in handy at any point in the game. Besides Silver Hand Recruit synergies, you can put them on the field and Fungalmancer or Spikeridged Steed your Silver Hand Recruit to make them bigger and useful. He is a useful minion in the 2-drop slot.
Val'anyr

Expansion: Kobolds & Catacombs
Called Value-nyr, Val'anyr is a weapon which automatically puts it in the good books. After destroying it, you can buff a minion in your hand and get the weapon back when it dies. You can keep buffing a random minion in your hand which gives you stat advantage as well as the advantage of having a weapon to mow down opponents minion or their face.
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